rinsche



F. C. RINSCHE.

TIME SWITCH FOR ADDING MACHINES.

APPLICATION FILED MAY15.19I6.

Patented July 22, 1919.

3 SHEETSSHEET I.

INVENTOR Z455 ATTORNEYS F. 0. RINWSMCHE.

TIME SWITCH FOR ADDING MACHINES.

APPLICATION FILED MAY 15, 1916.

Patented July 22, 1919.

3 SHEETS-SHEET 2.

[6 ATTORNEYS WITNESSES INVENTOR F. C. RINSCHE.

TIME SWITCH FOR ADDlNG MACHINES.

APPLICATION FILED MAY 15. I916.

Patented July 22, 1919.

3 SHEETSSHEET 3.

INVENTOR 70L ATTORNEYS WITNESSES UNITED STATES PATENT OFFICE.

FRANK C. RINSCHE, OF DETROIT, MICHIGAN, ASSIGNOB, TO BURROUGHS ADDING MACHINE COMPANY, 015

DETROIT, MICHIGAN, A

CORPORATION OF MICHIGAN.

TIME-SWITCH FOR ADDING-MACHINES.

To all whom it may concern:

'Be it'known that I, FRANK C. RINscHE, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Time-Switches for Adding Machines, of which the following is a specification.

y invention relates to adding machines which are driven by electric power, and more. particularly to such machines where the motor is of a continuously driven rotary type. In the operation of such machines as ordinarily constructed, after the number to be entered is set up in the keys, a finger bar is depressed which throws a clutch between the continuously running motor and the rock shaft of the machine into engagement which causes the operation of the rock shaft by which the number is carried into the machine. Before the machine is operated, the circuit of the motor must be closed and it then continues in continuous operation until the circuit is opened. Where an independently operated switch is relied upon for this purpose it frequently happens that the switch 1s inadvertently left in the closedv position,

with the result that there is considerable waste of current and useless wear upon the motor. My invention is designed to furnish a means by which the motor circuit is closed by the depression of the finger the motor is thrown into gear with or clutched to the machine driving mechanism, and continues closed so long as the machine is operated at the ordinary speed, or until a period elapses after the last operation such as would not ordinarily occur unless the operator had finished his work thereon. 'VVhen such a period of inaction ensues the timing mechanism of the switch automatically opens the circuit.

I have shown my improvement in connection with an electrically driven machine of the type disclosed in Vincent Patent No. 866,750, issued September 24, 1907, but it will be apparent from the disclosure below that the time switch is applicable to other forms of motor-driven machines, and in fact wherever a rotary motor is employed for driving a' machine in which there is a repeatedly manilpulated part.

Except in t e respects hereinafter noted Specification of Letters Patent.

enlarged scale of the bar by which acter wherever it.

Patented July 22, 1919.

Application filed May 15, 1916. Serial No. 97,708.

the adding machine proper, the motor, the clutch and the means for operating the clutch'to cause the motor to drive the adding machine proper are exactly as disclosed in the Vincent patent referred to above, and therefore need be only briefly referred to herein since reference may be had to the specification of said patent for a complete disclosnrethereof. Moreover though Ihave shown in the accompanying drawings and described hereinafter a preferred embodiment of my invention, it is to be understood that the specific disclosure is for the purpose of exemplification only, and that the scope of the invention is set forth in the following claims in which I have endeavored to distinguish it from the prior art so far as known to me without, however, relinquishing or abandoning any portion or feature thereof.

In the accompanying drawings, Figure 1 is a side elevation of so much of an adding machine proper as is necessary to an understanding of the invention, having the latter applied thereto, parts bein removed and cut away to better disclose t 1e construction; Fig. 2 is a fragmentary view in vertical section on the line 22 of Fig. 3, and on an enlarged scale as compared to Fig. 1; Fig. 3 is an elevation partly in section and on an driving mechanism shown in Fig. 1, the view being perpendicular to the plane of Fig. 1; Fig. 4 is an elevation of the timing mechanism viewed in the same direction as Fig. 2 but at a different stage of operation with parts in section upon a different plane; Fig. 5 is an elevation perpendicular to Fig. 4 of the same construction; Fig. 6 is a detail in section, and Fig. 7 is a detail in peispective on a plane parallel to the plane of Fig. 1. Each part is identified by the same reference charoccurs throughout the several views.

Referring first to Fig. 1, the adding Inachine proper is indicated at A as of the well known Burroughs type, for the details of whizh reference may be had to Patents Nos. 504,963 and 505,078, granted to William S. Burroughs, June 12, 1893. The motor may be of any suitable type and the connections by which the adding machine proper is driven from the motor are shown as substantially identical with those disclosed chine proper. Normally the shaft 9 is at rest even though the motor be running, the worm wheel 8 turning loosely thereon. Provision is made, however, for clutching or looking the shaft 9 to the worm wheel. For this purpose the worm wheel carries upon one side a concentric annulus 13, the outer periphery of which is formed with a series of semi-cylindrical recesses 14, and a disk 15 with a peripheral lateral flange 16 is pinned to the shaft 9 at 17 and carries a rotary semi-cylindrical key 18 in a position to be turned into one of the recesses of the annulus 13 when it is desired to lock the worm wheel to the shaft to secure an actuation of the adding machine proper. The key 18 is formed with a mutilated gear 19 which is in mesh with a similar gear formed upon the hub 20 of a lever 21, mounted upon the hub of the disk 15. and revoluble with and independently of said disk. The lever 21 is normally in contact with a stop 22 and when in this position the key 18 presents its flat side to the annulus 13 and the worm wheel is free to turn upon its shaft. The stop 22, which is also semi-cylindrical, is rotated out of engagement with the lever 21 when the adding machine is to be actuated, and this permits the lever 21 to be shifted by a spring into a position to throw the key into engagement with the annulus whereupon the adding machine is actuated. The stop 22 is mounted or which upon its outer end carries a mutilated gear 24 meshing with a similar gear 25 upon an arm 26. (See Fig. 2.) The arm 26 is controlled by the bar 27 which is raised when the finger bar 28 is depressed by the operator. Thus the depression of the finger bar through the rod 27 arm 26 and mutithrows the stop 22 out of the path of the arm 21 and permits an actuation of the machine as heretofore described. Unless the finger bar is maintained depressed the stop 22 intercepts the arm 21' as soon as it has completed a revolution and disengages the parts. The foregoing is an outline of the construction and operation of the mechanism which is fully shown and described in the Vincent patent referred to above.

My invention, as heretofore stated, relates to the means for controlling the supply of current to the motor. The rod 27 through which the clutch is controlled is also the formed upon a short shaft 23 medium whereby the supply of current to i the motor is controlled. A cord 29 carrying a pair of conductors may be attached to an outlet of a supply of current, the conductors at their other ends being connected respectively to the binding posts 30 and 31.

To the binding post. 30 is also. secured the for securing the knife upon the lever 37 consists in mounting it upon a stud 40, projecting from the face of said lever, a plate spring 41 riveted to the lever at 42 holding the knife in place. The latter is insulated from the supporting lever and spring respectively by insulating washers 43 and collar 44, the spring being slotted at 45 to receive the end of the stud 40 and its surrounding insulation as shown in Figs. 2 and 4. By the construction described the pressure of the late spring on the washer yieldingly maintains the knife-blade in the proper position for engagement with the plate springs 34, 35.

As best shown in pressed in a direction to close the switch by means of the spring 46, the end of which is attached at 47 to a stud on the stationary frame. The arm 37, however, is normally restrained in the open position by a latch '48 which engages a shoulder or abutment 49 upon the arm for this purpose. A spring 50 likewise connected to the stud 47 serves to normally maintain the latch inin-operthe plate springs 34, 35, of a I Fig. 2 the arm 37 is ative position. The tail 51 of the latch extends into the path of movement of a washer 52 secured to the lower end ofthe rod 27 heretofore described as constituting apart of the clutch controlling mechanism, so that when said rod is raised by the de ression of the finger bar 28 it engages an latch 48, permitting the arm 37 to be swung by spring 46 to close the switch. See Fig. 2. The closing of the switch completing'the circuit through the motor energizes the latter and it continues in operation until the knife switch is again opened in the manner heremafter described.

Upontheend of the shaft 9 is mounted a snail-cam 53 which partakes of the rotation of the shaft. The cam bears upon a roller 54 carried by a bell-crank lever 55 which is pivoted upon the same stud 38 which forms the fulcrum for the switch arm 37. The

bell-crank lever is also connected by a stud 56 to the yoke 57 on the upper end of rod 58 connected to the piston 59 of a dash pot 60 (Figs. 4 and 5). The dash pot is shown as trips the.

Which engages said arm the latter. The

of a familiar form in which openings 61 formed in the piston controlled by a valve 62 permit the ready flow of the oil or other liquid contained in the dash pot cylinderthrough the piston when the latter is descending, but prevent the flow of oil therethrough when the piston is ascending, so that the only flow of oil is about the periphery of the piston which is made loosefitting with this in view. The dash pot cylinder is pivoted at 63 to permit the free movement of the parts. A spring 61 is secured to the bell-crank lever to restore the same to its normal position after having been depressed by theaction of the cam upon the roller on said lever, but the action of the dash pot, which is suitably timed for the purpose, retards .the upward movement of the bell-crank. In the present instance thedash pot is so constructed as to retard the movement of the lever to the extent of about fifteen seconds.

The latch 48 is pivoted at 65 to an arm 66 of the T-shaped lever 66. which, like the switch lever 37 and bell-crank lever 55, is pivoted on the stud 38, and is normally maintained in the position shown in Fig. 2 by a spring 67 attached at one end 68 to said lever, and at the other end 69 to the clutch casing 39. The bell-crank lever 55 is provided near the end of its downwardly extending arm with a stud 70 which, when said bell crank approaches the limit of its movement under the influenceof the cam, engages the downwardly-extending arm 71 of said T-shaped lever.66 and shifts said arm to the left as shown in Fig. .4. This movement of the T-shaped lever raises the catch 48 pivoted'thereonsufiiciently to permit it to rengage the shoulder 49 upon the switch lever notwithstanding the closed position of switch is not opened at this time, however, because a latch 72 is provided for maintaining the lever 71 in the position to the left shown in Fig. 4. The latch 72 is pivoted to a stationary part at 73 and is formed with a pair of shoulders 74, 75, against the former of which inwardlyfbent end 76 of the arm 71 of the T-shaped lever engages when the device is in its normal position, as shown in Fig. 2,

when it is in the position shown in Fi 1. It will be seen therefore that the latch 72 maintains the lever 71 in the position shown in Fig. 4, after the stud 70 is withdrawn from con tact therewith by reason of the tension of the spring'64 operating against the resistance of the dashpot to raise the laterally extending end of the bell-crank 55, and thus shift the lower end of said bell-crank to the right. In order to release the arm 71 of the T-shaped lever from the latch and permit said lever to return to its normal position, a link 77 is pivoted at its upper end to dled by a fork and the other of the piston rod, upon the screw 56, and has a lost motion connection with the latch 72 by means of a pin 78 and slot 79, which permits the dashpot plunger and bell-crank lever 55 to return to almost normal position, and then to act upon the latch to raise the latter and permit the -shaped lever 66 to return to its normal position. If the catch 48 is at this time still in engagement with the switch lever, since the spring 67 is sufficiently strong to over ower the spring 46 with the leverages empibyed, the final movement of lever 66 restores the switch lever to the open position.

he adding machine is preferably provided as usual with a clutch connection 80 for attaching the handle for hand-manipulation of the machine when desired. For obvious reasons it is desirable to avoid the accidental operation of the motor when the handle is attached for hand-operation. In order to avoid such accidental operation I provide means operated by the application of the handle to the machine for locking the switch against closing. Such means comprises an arm 81 rigidly secured to the hub 82 of the switch lever, and provided with a laterally extending stud 83 which is strad- 81 upon the lower end of a vertically shiftable bar 85. The bar 85 may be formed in two sections connected by a screw and slot 86, 87, for adjustment and is guided bya screw 88 upon the frame of the adding machine proper engaging a slot 89 in the offset upper end 90 of said bar. The tip of said bar is bent inwardly and offset laterally at 91 and extends within a notch 92 in a second vertically reciprocating bar 93, the lower end of which is guided by a pivoted connection 94 with a lever 95, and the upper end of which is guided by a screw and slot connection to the frame at 96. The

tip of this second vertically sliding bar extends partially into the opening 97 of the clutch member 80, which opening as usual receives a beveled pin upon the handle. said sliding bar being normally maintained in the upper position by means of the springoperated lever 95. \Vith the parts in the position shown in Fig. 1 the switch lever is freely movable. When, however, the handle is attached to the machine, the conical pin thereon depresses the slide 93, which in turn engages the slide 85 and holds the latter in the depressed position in which the fork thereon engages thestud 83'upon the arm 81, and maintains the latter in its lower position with the switch open.

eferring more particularly to Figs. 1 and 7, the full stroke sector is shown at 104, and the full stroke pawl at 103, these parts being common in the Burroughs type of adding machine in connection with which the present invention is illustrated. In such construction the pawl 103 is normally maintained in position to engage the sector 104 by a spring 105. It is desirable, however, when the machine is electricallydriven that this full stroke mechanism be thrown out of operation. For this purpose the lever 95 has a tail 106v which engages a stud 107 on the full. stroke pawl and throws said pawl out of engagement with the sector when the handle is not on the machine, at which time the pawl 93 is in its uppermost position and the lever 95 held in the position shown in Fig. 7 by a spring 108. When, however, the lever 95 is swung about its fulcrum 109 by the application of the handle, as above described, the tail piece 106 is lifted and the lower branch 110 of a dog 111, to which spring 108 is attached, and which is pivoted on lever 95 at 112, engages the stud 107 and forces the full stroke pawl into position to engage the full stroke sector. The movement of the dog 111 relative to the lever 95 is limited by a stop 113. a

A cast metal, or other suitable casing 98 surrounds the switch mechanism just described, and comprises a boxing 99 and a cover-plate 100. The cover-plate is recessed or notched at 101 upon one of its edges which engage the boxing for the extension of the arm 81 to the outside of the casing, where it is provided with an operating handle or finger piece 102. A shoulder or offset 103 is provided'upon the edge of said recess in the cover-plate such that the arm 81, which is of sufliciently resilient material for the purpose, may-be swung from its normal operative position to a position below said shoulder, and locked there to maintain the switch lever in inoperative position.

The operation of the device has been described in connection with the description of the various elements thereof, but may be briefly and connectedly repeated as follows:

After a number which it is desired to enter in the machine has been set up, the finger bar 28 is depressed, raising the vertical bar 27 operating the clutch mechanism heretofore described, and tripping the catch 48. The last named operation permits the switch arm 37 to carry the knife into engagement with the contacts 34, 35, thus closing the circuit through the motor and operating the latter. This causes the revolution of th snail 53 which engages the roller 54 upon the bell-crank 55, depressing the upper arm of the latter and the plunger of the dash pot. crank throws its lower arm to the left and ultimately into engagement with the downwardly extending arm 71 of the T-shaped lever, and the final motion of the bell-crank swings the arm 71 to the left raising the latch 48, thus permitting the latter toagain engage the shoulder 49 upon the switch lever. At the same time the latch 72 engages the lower end of the i -shaped lever eration may The movement of the belland maintains it in the left hand position tion of the finger 28, the T-shaped lever when released will carry the switch lever to the open position because of the engagement thereof by the catch 48. If, however, in the meantime there has been a second operation of the finger bar, the catch 48 is again tripped in the manner previously described so that the switch lever is released and any movement of the T-shaped lever toward normal position has no effect uponthe switch lever. The motor being still supplied with current thus completes a second revolution, the device operating as before, and this operation is continued until such time as the operator fails to depress the finger bar between the movement of the T- shaped lever from normal position to its return thereto, which period as" heretofore pointed out, depends upon the construction of the dash pot. When this occurs the switch lever is thrown to open position cutting out the current from themotor, and the entire device is at rest in normal position.

In the event that the machine should overthrow and the revolution of the cam be carried beyond the normal position to partially actuate the device, the partial opbe completed by manually throwing the switch lever to closed position by raising the handle 102 thereon. This closes the circuit without distributing any of the other parts of the device,

I claim:

1. In an electrically driven adding machine and in combination with the adding machine proper, a motor for driving the same, rotary means'intermediate the adding machine proper and motor for driving the former from the latter, a clutch between the motor and rotary means and a switch for controlling the supply of current to the motor, of a manipulative device for enabling the simultaneous closing of the switch and clutch.

2. In an electrically driven adding machine, and in combination with the adding machine proper, a motor for drivin the same, rotary means intermediate the a ding machine proper and motor for driving the former from the latter, a clutch intermediate the rotary means and motor and a:

eration of said 1 determined 'interval after the closing of the rotary means tion of the motor chine proper,

'means,and means controlled by clutch.

3. In an electrically driven adding machine and in combination with theadding machine proper, motor for driving the same, rotary means intermediate the adding-ma chine proper and motor, clutch for coupling the motor to the rotary means and switch for controlling the supply of current to the motor, of a manipulative means set by the operation ofthe rotary means to open the switch, and a dashpot connected thereto for delaying the opening of the switch. I j

4. In an electrically driven adding machine, the combination with the adding machine proper, a motor for driving'the same, intermediate the adding machine proper and motor for driving the former from the latter, a'.clutch for coupling the motor to the rotary means, a manipulative device for controlling said clutch and a switch for controlling the supply of current to the motor, of means controlled by the manipulative switch,.and means controlled by the operafor opening the switch a predetermined interval after the clutch has been opened.

5. In an electrically driven adding machine, the combination with the adding maa motor for driving the same, rotary means intermediate the addingmachine and motor for driving the former from the latter, means for coupling the motor to" said rotary means, amani ulative device for controlling the last sai means and a switch for controlling the motor comprising a movable element, of means for means normally maintaining said element in open position, means operated b the manipulative device for releasing the last said I the opera tionof the motor to restore said element to open position.

6. In an electrically chine, the combination machine proper, a motor for drivin the same, rotary means intermediate the a ding machine and motor for driving the, former from the latter,'means for couplin the mo tor to said rotary means, a mani u ative device for controlling the last sai means and a switch for controlling the motor comprising a movable element, of means for moving the element to close the switch. means for returning said element to open position after the expiration of a predetermined period following the closing of the switch, and means controlled by the manipulative device for preventing the return of said element to open position.

In an electrically driven adding madriven adding mawith the adding opening means for a predevice for closing the moving theelement to close the switch,

chine, the combination with the adding" machine proper, a motor for driving the same, rotary means intermediate the adding machine and motor for driving the .former from the latter, means for coupling the motor to said rotary means, a manipulative device for controlling the last said means and a switch for controlling the motor comprising a movable element, of means for moving the element to close the switch, meansfor returning said element to and maintaining it in open position including a catch adapted to engage the same, and means for disengaging the catch when said manipulative device is operated.

8. In an electrically driven adding machine, the combination with the adding machine proper, a motor for driving the same, rotary means intermediate the adding machine and motor for driving the former from the latter, means for coupling the motor to said rotary means, a manipulative device for controlling the last said means and a switch for controlling the motor comprising a movable element, of means for moving the element to close the switch, means including a catch for engaging said element and returning it to open position after the expiration ofa predetermined period .fol-

owing the closing of the switch and means for disengaging the catch when said manipulative device is operated.

9. In a device of the class described, a motor, a switch controlling the supply of current to the motor comprising a movable element, means for moving the element to close the switch, means for engaging said element when in closed position and moving it to and maintaining it in open position, and 'manipulative means for releasing the element from said engagement.

10. In a device of the class described, a motor, a switch controlling the supply of current to the motor comprising a movable element, means for moving the element to close the switch, means including a catch for engaging said element when in closed position and moving it to and maintaining it in open position, and manipulative means for releasing said catch.

11. In a device of'the class described, a motor, a, switch controlling the supply of current to the motor, comprising a movable element, means for moving the element to close the'switch, a lever,

means on the lever to engage said element when in closed position, means for moving said lever to carry said element to open position, means operated by the motor to move the lever to engage the element when the latter is in closed position, and a manipulative device for disengaging the element from the lever.

12. In a device of the class described, a' motor, a switch controlling the supply of current to the motor, comprising a contact arm,

movable element, means for moving the element to close the switch, a lever, means onthe lever to engage said element when in closed position, means for moving said lever to carry said element to open position, means operated by the motor to move the lever to engage the element when the latter is in closed position, and a manipulative device for disengaging the element from the lever.

' 13. In a device of the class. described, a motor, a switch controlling the supply of current to the motor comprising a movable a spring for moving the same to closed position, means for moving the arm to and maintaining it in open position comprising a lever having a catch for engaging said arm, means for moving the lever to permit the catch to engage the arm in closed position, means for moving the lever after such engagement is effected torestore the arm to open position, and a manipulative device to release the arm from the catch. v

14. In a device of the class described, a motor, a .switch controlling the supply of current to the motor comprising a movable contact arm, a spring for moving the same to closed position, means for moving the arm to and maintaining it in open position comprising a lever having a catch for engaging said arm, means operated by the motor for moving the lever to permit the catch to engage the arm in closed position, means for moving the lever after such engagement is eifected to restore the arm to open position, and a manipulative'device to release the arm from the catch.-

15. In a device of the motor, a switch controlling the supply of current to the motor, comprising a movable contact arm, a spring for moving the same to closed position, means for engaging the arm when inclosed position and moving it to and maintaining it in open position, means for-delaying, the return of the varm to open position and manipulative means for releasing the arm from said engagement.

16. In a device of the class described, a motor, a switch controlling the supply of current to the motor, comprising a movable contact arm, a spring for moving the same to the closed position, means for moving the arm to and maintaining it in open position comprising a lever having a catch for engaging said delaying such movement, and manipulative means to release the arm from the catch.

17 In a device of the class described, a

motor, a switch controlling the supply of current to the motor, comprising a movable class described, a

arm, means for moving the lever to permit the catch to engage the arm contact arm, and spring for moving the same to closed position, means for moving the arm to and maintaining it in open position, comprising a lever having a catch for engaging said arm, means operated by the a motor, a switch controlling the supply of current to the motor, comprising a movable 7 contact arm, a spring for moving the arm the arm when the latter is in'closed position,

and means for delaying the return of the lever to normal position.

19. In a mechanism of the class described,

a motor, a switch controlling the supply of current to the motor comprising amovable contact arm, a spring for moving the arm to closed position, a lever, a catch on the lever normally engaging said' arm and ma ntaining it in 0 en position, a manipulative device for isengaging said catch from the arm, a spring normally maintaining the lever in position to hold the arm in open position when engaged by the catch, means operated by the motor for shifting said lever against the tension of its spring to a position such that the catch will engagethe arm when the latter is in closed pos1t1on,' means for restraining the leverIin such position, and means for releasing said lever after a predetermined interval and permitting it to return to normal position.

20. In a mechanism of the class described, a. motor, a switch controlling the supply of current to the motor comprlsin a movable contact arm, a spring for moving the arm to closed position, a lever, a catch on the lever normally engaging said arm and ma ntalmng it in open position, a manipulat ve device for disengaging said catch from the arm, a spring normally maintaining the lever in position to hold the arm in open position when engaged by the catch, a second lever, means. driven by the motor for operatln the second lever, a spring for re- 1-8. In a mechanism of the class described,

storing t e second lever to normal position,

emme means on the second lever adapted to engage the first said lever to move the same to a position in-which the catch will engage the switch arm while the latter is in closed position, and means for returning the first said lever to normal position after a predetermined interval.

21. In a mechanism of the class described, a motor. a switch controlling the supply of current to the motor comprising a movable contact arm, a spring for moving the arm to closed position, a lever, a catch on the lever normally engaging said arm and maintaining it in open position, a manipulative device for disengaging said catch from the arm, a spring normally maintaining the lever in position to hold the arm in open position when engaged by the catch, a second lever, motor driven means for operating the second lever, a spring for restoring the second lever to normal' position, means on the second said lever for engaging the first said lever and shifting the same when the second said lever is operated by the motor, a detent for maintaining the first said lever in shifted position, and means connected to the second said lever for shifting said detentto release the first said lever after a predetermined interval.

22. In a motor-driven adding machine and in combination with the adding machine proper and motor thereof, a switch for controlling the motor circuit comprising an arm carrying the movable member of the switch, a catch for normally maintaining the arm in open position, manipulative means for releasing the catch, means for swinging the arm to closed position when released by the catch, a socket upon the adding machine proper for receiving a handle for operating the same by hand, and means arranged to be engaged by the handle when inserted in the socket to lock said arm in open position.

23. In a motor-driven adding machine comprising the adding machine proper having asocket for the reception of a handle for hand-operating the same, a motor and connections from the motor for operating the adding machine, a switch controlling the circuit of the motor comprising a movable arm, a catch normally maintaining the arm in open position, a manipulative device for engaging the catch and releasing the arm, means for moving the arm to closed position when released by the catch, a reciprocable member on the adding machine proper, means normally maintaining the same partially within the space occupied by the handle when the latter is connected to the socket whereby the member is adapted to be shifted by the application of the handle to the socket, and means arranged in the path of said member and adapted to be shifted thereby to lock the arm of the switch in open position.

24. In a motor-driven adding machine comprising an adding machine proper, having a socket 80 for the attachment of an operating handle, a motor and connections from the motor for driving the adding machine proper, a switch for the motor comprising a movable arm, means tending to move the arm to closed position, a catch normally engaging the arm and maintaining it in means adapted to engage the catch and release said arm to permit the latter to go to closed position, a reciprocating member 85 adapted to be moved to lock said arm in open position, and a slide 93 adapted to engage said lockin member and so arranged with respect to t 1e socket as to be engaged bythe handle when inserted in'the socket,

and shifted to force the locking member to operative position.

FRANK C. RINSCHE. Witnesses:

R. S. MIELERT, J. A. BROPHY.

open position, a manipulative 

